Data Sheet

Page 103
RFM95/96/97/98(W)
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WIRELESS & SENSING PRELIMINARY DATASHEET
Name
(Address)
Bits
Variable Name
Mode Reset
LoRa
TM
Description
RegFrLsb
(0x08)
7-0 Frf(7:0) rwt 0x00
LSB of RF carrier frequency
f =
----
(
--
X
----
O
-----
S
---
C
----
)
---
·
---
F
----
r
---
f
RF
2
19
Resolution is 61.035 Hz if F(XOSC) = 32 MHz. Default value is
0x6c8000 = 434 MHz. Register values must be modified only
when device is in SLEEP or STAND-BY mode.
Registers for RF blocks
7 PaSelect rw 0x00
Selects PA output pin
0 Æ RFO pin. Output power is limited to +14 dBm.
1 Æ PA_BOOST pin. Output power is limited to +20 dBm
6-4 MaxPower rw 0x04 Select max output power: Pmax=10.8+0.6*MaxPower [dBm]
RegPaConfig
(0x09)
3-0 OutputPower rw 0x0f
Pout=Pmax-(15-OutputPower) if PaSelect = 0 (RFO pin)
Pout=17-(15-OutputPower) if PaSelect = 1 (PA_BOOST pin)
7-5 unused r - unused
4 reserved rw 0x00 reserved
RegPaRamp
(0x0A)
3-0 PaRamp(3:0) rw 0x09
Rise/Fall time of ramp up/down in FSK
0000 Æ 3.4 ms
0001 Æ 2 ms
0010 Æ 1 ms
0011 Æ 500 us
0100 Æ 250 us
0101 Æ 125 us
0110 Æ 100 us
0111 Æ 62 us
1000 Æ 50 us
1001 Æ 40 us
1010 Æ 31 us
1011 Æ 25 us
1100 Æ 20 us
1101 Æ 15 us
1110 Æ 12 us
1111 Æ 10 us
7-6 unused r 0x00 unused
5 OcpOn rw 0x01
Enables overload current protection (OCP) for PA:
0 Æ OCP disabled
1 Æ OCP enabled
RegOcp
(0x0B
4-0 OcpTrim rw 0x0b
Trimming of OCP current:
Imax = 45+5*OcpTrim [mA] if OcpTrim <= 15 (120 mA) /
I
max = -30+10*OcpTrim [mA] if 15 < OcpTrim <= 27 (130 to
240 mA)
I
max = 240mA for higher settings
Default I
max = 100mA